Add sharding e2e test to Github Actions

[priyawadhwa]

Signed-off-by: Priya Wadhwa priya@chainguard.dev

depends on #712 to merge first

Summary

Ticket Link

Fixes

Release Note

[codecov-commenter]

Codecov Report

Merging #714 (ecec708) into main (c3a7f89) will increase coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
+ Coverage   47.53%   47.60%   +0.07%     
==========================================
  Files          65       65              
  Lines        5669     5669              
==========================================
+ Hits         2695     2699       +4     
+ Misses       2684     2680       -4     
  Partials      290      290              

Impacted Files	Coverage Δ
cmd/rekor-cli/app/log_info.go	3.00% <0.00%> (ø)
pkg/types/rekord/v0.0.1/entry.go	51.51% <0.00%> (+0.60%)	⬆️
pkg/types/alpine/v0.0.1/entry.go	62.01% <0.00%> (+0.77%)	⬆️

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